Metal detector



FIG. 1 is a top perspective view of a metal detector showing our new design;

FIG. 2 is a front elevation view;

FIG. 3 is a left side elevation view;

FIG. 4 is a right side elevation view;

FIG. 5 is a rear elevation view;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a metal detector, as shown and described. 